Layout and Layout Verification. of an Inverter Circuit
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1 Layout and Layout Verification of an Inverter Circuit Santa Clara University Department of Electrical Engineering By Piyush Panwar Under Guidance of Dr Samiha Mourad Date of Last Revision: August 7, 2010 Copyright 2006
2 Table of Contents 1. Objective Setup & Preparation Launching IC Studio Opening the project Opening icstudio and opening the project Opening Layout Cell Drawing the Layout Actual Inverter Layout Adding Well Ties Making Ports Save/Reserve Cell Copyright
3 1. Objective This tutorial shows a step-by-step procedure for creating a custom (manual) layout of the inverter schematic that you created in Schematic entry tutorial. The final schematic is shown in the figure below. It also helps you verify your layout by using the IC Station physical verification tools Calibre to perform simple DRC (Design Rule Check), and LVS (Layout vs Schematic) check. Copyright
4 2. Setup & Preparation The set of directives listed below is applicable to users of the Engineering Design Center at Santa Clara University. If you are working in a different environment please check with your system administrator. The steps below are necessary only for the first time to setup the Mentor Graphics environment by changing the settings in your.profile file. Add the following lines in your.profile: setup mentor alias swd= export MGC_WD=\ pwd\ Remember to execute $..profile Copyright
5 3. Launching IC Studio On the command line To Create a directory to contain your projects type: mkdir Tutorial To change the current directory to Tutorial type: cd Tutorial. To open ICSTUDIO type: icstudio. This launches the ICStudio window shown below. Copyright
6 4. Opening the project To create a project the follow the three steps given below: 1. Opening icstudio and opening the project On the ICStudio Window Click File -> Open -> Project to create a new project. Enter the Project name (e.g vlsi_tutorial) and the Project Location Click Open in the Open Project pop-up window 2. Opening Layout Cell Right click on the name of the Schematic you entered (eg.; Inverter) and click New View. Select View Type as Layout. Click Finish. Copyright
7 The following window will open wherein you can draw your schematic layout. Copyright
8 Note: Before you make any changes to your work, make sure your work is in the 'Edit' mode. Copyright
9 5 Drawing the Layout For this Click File> Enable editing > Current Context NOTE: The layout will not be automatically drawn for you. You need to draw it on your own through scratch. The above figure is just for illustration. How to enable editing mode. Copyright
10 1. Actual Inverter Layout Now that we are familiar with basic editing commands, lets start with the layout of the inverter. Note:In the working space, one unit is equal to one Lambda (). (refer to the cursor coordination on the window frame). If you follow the Lambda rules for TSMC0.35u technology, the smallest feature size will be 2 = 0.4u (for poly width and contact size). Therefore we have 1 = 0.2micron To Create the NMOS with 0.4 micron length and 1.2 micron width: o Click ACTIVE(43) on RHS of the window. o Click Draw Rectangle on the LHS of the window and draw a 6X6 square of layer 43. o Next create CONTACT_TO_ACTIVE (48) 2 x2 Square. o Next create 6 x6 METAL1 Square for Contact.. The result should look like in the following figure. Select both the shapes and Click Edit> Copy> Selected Copyright
11 Next Click Edit> Paste Place all these shapes beside the original ones with 4 spacing. They are source and drain contacts. Create 6 x 16 ACTIVE (active area) to cover exactly source and drain metal contact. Next To Make the PMOS: o Click ACTIVE(43) on RHS of the window. o Click Draw Rectangle on the LHS of the window and draw a 6X6 square of layer 43. o Next create CONTACT_TO_ACTIVE (48) 2 x2 Square. o Next create 18 x6 METAL1 Square for Contact. Note: Distance between the NMOS and the PMOS should be at least 13 Select all the shapes and Click Edit> Copy> Selected Next Click Edit> Paste Copyright
12 Place all these shapes beside the original ones with 4 spacing. They are source and drain contacts. Create 18 x 16 ACTIVE (active area) to cover exactly source and drain metal contact. Next create a 41 X 2 poly between the drain and source contacts for NMOS and PMOS. Add 22 x 20 P_PLUS_SELECT for PMOS and 10 x 20 N_PLUS_SELECT for NMOS. The spacing between N_PLUS_SELECT and P_PLUS_SELECT should be kept at least 9 for correct NWELL and PWELL spacing as shown below. Copyright
13 Note: It is always better to add as many CONTACTS as possible to reduce the contact resistance. So add 3 contacts in the Source area of PMOS (with 3 distance in between the contacts) and 4 contacts in the drain area of PMOS (with 2 distance in between the contacts) as shown in the adjacent figure. Note: As per the design rules of TSMC0.35, minimum separation between two contacts should be 3. Add 30 x 28 NWELL for PMOS and 18 x 28 PWELL for NMOS. The spacing between NWELL and PWELL should be at least 1. Copyright
14 Add METAL1: to form Vdd (power wire) and GND (ground wire). Note that METAL1 should have at least 3 width and 3 spacing (METAL1 to METAL1 spacing). Now, connect PMOS-source to Vdd and that of NMOS to GND with METAL1. (Use 'Notch For this select the shape you want to notch or connect and click Edit-> Notch Use your Left Mouse Button to alter Move the shape as desired and when you are done press Escape) Connect the drains of both transistors by METAL1, to get OUTPUT net of the inverter. Copyright
15 The figure when you have notched the Vdd, GND and POLY would look as under: Copyright
16 : 6. Adding Well Ties Use Notch to extend the left hand side edges of WELL, ACTIVE (active area), and METAL1 of the SOURCES of both NMOS & PMOS by 8. Add N_PLUS_SELECT inside NWELL and P_PLUS_SELECT inside PWELL. Also add contacts to both N_PLUS_SELECT and P_PLUS_SELECT with 3 spacing.. Notice that the PMOS's source is connected to Vdd and NMOS's source is connected to GND. By connecting the body of the wells to the sources through metal1 we are connecting the NWELL to Vdd and the PWELL to GND. The final figure when you have notched the Vdd, GND and POLY would look shown: Copyright
17 7. Making Ports We will use METAL1 for all ports, so the first thing we must do is route the POLY gate to a suitable METAL1 trace. Select CONTACT TO POLY (47) from the RHS layer palette. Create a 2 x 2 square of CONTACT TO POLY on the left side of the POLY Select the POLY trace and use the NOTCH tool to surround the contact by 2 on each side. Add a square of METAL1 over the POLY/CONTACT TO POLY pad The figure should look like the drawing below: Copyright
18 Labeling Ports: Click on the top Metal polygon (Drain of the PMOS) to select it. From main menu bar, select Connectivity -> Port -> Make Port: For the Port Name, enter VDD. Make sure the Port Type is Signal and Direction is in. Then click OK Repeat the steps above to assign GND, IN and OUT ports. Note: 'GND' and 'IN' are of 'in' Direction while 'OUT' is of 'out' Direction. Copyright
19 Select METAL1.PORT (2) on RHS of the window. Select, from main Menu Bar, Add -> Text Enter the label VDD and place the text object on the VDD metal line. Repeat for the OUT, GROUND, and IN metal lines. Note: Be sure to label the GND port as GROUND. This name is required for the LVS check to work correctly. Copyright
20 8. Save / Reserve Cell To save Cell: Select, from main Menu Bar, File -> Cell -> Save Cell Note: After you save your work, the system will automatically set your work to 'Read-Only' mode. To set your work to 'Editable' mode, Click File> Enable Editing>Current Context Your final cell should match the one shown below: Copyright
21 To Run DRC: File Cell Set Logic Source 9. DRC/LVS Mentor Graphics window Pops up Select Schematic OK Copyright
22 From Menu bar: Click Calibre Run DRC Calibre Interactive_nmDRC window pops up Select Run DRC on left panel Copyright
23 LVS: From Menu Bar: Click on Calibre Run LVS Copyright
24 Calibre Interactive _nmlvs eindow pops up Select Run LVS (on left panel of window) Copyright
25 If your LVS pass out you get a smiley on the caliber_lvs RVE window as shown below. Copyright
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